Stroller frame



FIG. 1 is a perspective view of a stroller frame of the new design;

FIG. 2 is a front view of the stroller frame of the new design;

FIG. 3 is a rear view of the stroller frame of the new design;

FIG. 4 is a top view of the stroller frame of the new design;

FIG. 5 is a bottom view of the stroller frame of the new design;

FIG. 6 is a left-side view of the stroller frame of the new design;

FIG. 7 is a right-side view of the stroller frame of the new design;

FIG. 8 is another perspective view of the stroller frame of the new design; and,

FIG. 9 is a front perspective view of the stroller frame of the new design. 

The ornamental design for a stroller frame, as shown. 